package de.idyl.crypto.zip;

public interface ZipConstants {

  /*
   * Header signatures
   */
  static long LOCSIG = 0x04034b50L; // "PK\003\004"
  static long EXTSIG = 0x08074b50L; // "PK\007\008"
  static long CENSIG = 0x02014b50L; // "PK\001\002"
  static long ENDSIG = 0x06054b50L; // "PK\005\006"

  /*
   * Header sizes in bytes (including signatures)
   */
  static final int LOCHDR = 30; // LOC header size
  static final int EXTHDR = 16; // EXT header size
  static final int CENHDR = 46; // CEN header size
  static final int ENDHDR = 22; // END header size

  /*
   * Local file (LOC) header field offsets
   */
  static final int LOCVER = 4; // version needed to extract
  static final int LOCFLG = 6; // general purpose bit flag
  static final int LOCHOW = 8; // compression method
  static final int LOCTIM = 10; // modification time
  static final int LOCCRC = 14; // uncompressed file crc-32 value
  static final int LOCSIZ = 18; // compressed size
  static final int LOCLEN = 22; // uncompressed size
  static final int LOCNAM = 26; // filename length
  static final int LOCEXT = 28; // extra field length

  /*
   * Extra local (EXT) header field offsets
   */
  static final int EXTCRC = 4; // uncompressed file crc-32 value
  static final int EXTSIZ = 8; // compressed size
  static final int EXTLEN = 12; // uncompressed size

  /*
   * Central directory (CEN) header field offsets
   */
  static final int CENVEM = 4; // version made by
  static final int CENVER = 6; // version needed to extract
  static final int CENFLG = 8; // encrypt, decrypt flags
  static final int CENHOW = 10; // compression method
  static final int CENTIM = 12; // modification time
  static final int CENCRC = 16; // uncompressed file crc-32 value
  static final int CENSIZ = 20; // compressed size
  static final int CENLEN = 24; // uncompressed size
  static final int CENNAM = 28; // filename length
  static final int CENEXT = 30; // extra field length
  static final int CENCOM = 32; // comment length
  static final int CENDSK = 34; // disk number start
  static final int CENATT = 36; // internal file attributes
  static final int CENATX = 38; // external file attributes
  static final int CENOFF = 42; // LOC header offset

  /*
   * End of central directory (END) header field offsets
   */
  static final int ENDSUB = 8; // number of entries on this disk
  static final int ENDTOT = 10; // total number of entries
  static final int ENDSIZ = 12; // central directory size in bytes
  static final int ENDOFF = 16; // offset of first CEN header
  static final int ENDCOM = 20; // zip file comment length

}
